Low melting point and poor conductor of electricity

Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.

Explanation:

3 0

3 years ago

28. How many formula units are found in 0.250 moles of potassium nitrate?

Soloha48 [4]

Answer:

$\boxed {\boxed {\sf B. \ 1.5 *10^{23} \ formula \ units}}$

Explanation:

1 mole of any substance contains the same number of particles. The particles can vary (atoms, molecules, formula units), but there are always 6.022*10²³ particles. In this case, the particles are formula units of potassium nitrate or KNO₃.

Let's create a ratio.

$\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

Since we are trying to find the formula units in 0.250 moles, we multiply by that number.

$0.250 \ mol \ KNO_3 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

The units of moles of potassium nitrate cancel.

$0.250 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 }$

The denominator of 1 can be ignored, so we can make a simple multiplication problem.

$0.250 *{6.022*10^{23} \ formula \ units \ KNO_3}$

$1.5055 * 10^{23} \ formula \ units \ KNO_3$

If we round to the nearest tenth, the 0 in the hundredth place tells us to leave the 5 in the tenth place.

$1.5 *10^{23} \ formula \ units \ KNO_3$

0.250 moles of potassium nitrate is approximately equal to 1.5*10²³ formula units of potassium nitrate and choice B is correct.

7 0

3 years ago

The formal charge is the "charge" an element would have in a molecule or ion if all of the bonding electrons were shared equally

Fiesta28 [93]

Answer:

Explanation:

check below for the solution

5 0

3 years ago